Test Time-Stamping Service

TimeStamping Service is a service that issues time-stamps. Time-stamps confirm that the data existed at a specific time. The service has been described in Internet standard RFC-3161 (http://www.ietf.org/rfc/rfc3161.txt).

Time-Stamping service is a simple client-server system, where a time-stamping service client sends the time-stamping request to the service (server) to verify the existence of a set of data in specific time. Time-Stamping service then returns a digitally signed confirmation of data existence in time. Time-Stamping service is a HTTP service and time-stamping requests are submitted as HTTP POST queries.

Test Time-Stamping service is located at: http://demo.sk.ee/tsa/

Time-Stamping service parameters are the following:

  • supported hash algorithms for time-stamping requests: SHA256, SHA384, SHA512,
  • digital signature key parameters for signing time-stamps: 2048bit RSA,
  • digital signature algorithm for signing time-stamps: SHA512withRSA,
  • time-stamping service policy OID:,
  • repository for Time-­Stamping Authority Practice Statement: https://www.sk.ee/en/repository/tsa,
  • supported time-stamping service policies for requests:,
  • supported time-stamping service extensions for requests: not specified.

Service replies to correct requests include:

  • status info – Operation Okay,
  • hash algorithm used for signing,
  • time-stamp policy OID,
  • time-stamp time,
  • time-stamping service certificate (without a full certificate chain),
  • used extensions,
  • nonce value,
  • accuracy (0x01 seconds)
  • tsa (general name of the Time Stamp Authority - subject DN of the signing certificate)

Service replies to incorrect requests include::

  • status info – Rejected,
  • cause of error.

Service checks the time-stamping request’s validity and in case of invalid requests the HTTP status code reply is: 400 – Bad Request.




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